1. Simple description: SPA-H weathering steel, also known as atmospheric corrosion-resistant steel, refers to a type of low-alloy high-strength steel containing a small amount of alloying elements, low price, and good corrosion resistance in the atmosphere. The main alloying elements are Cu, P, Cr, Ni, Si, Mn, V, RE, etc. During the use of weathering steel, a dense and firmly attached protective film of corrosion products will gradually form on the surface to prevent oxygen, water and other corrosive media in the atmosphere from further corroding the substrate, so that the corrosion rate is greatly reduced compared to carbon steel. . Due to its high strength and reasonable price, the production cost is much lower than stainless steel. SPA-H executive standard is: JISG3125-2015. 2. Chemical Composition:

Grade	Chemical Composition (%)
	C	Si	Mn	P	S	Cu	Cr	Ni
SPA-H	≤0.12	0.2-0.75	≤0.60	0.07-0.15	≤0.035	0.25-0.55	0.30-1.25	≤0.65
Q235NH	≤0.13	0.1-0.4	0.2-0.6	≤0.030	≤0.030	0.25-0.55	0.4-0.8	≤0.65
Q355NH	≤0.16	0.5	0.5-1.5	≤0.030	≤0.030	0.25-0.55	0.4-0.8	≤0.65
Q450NQR1	≤0.12	0.4	0.7-1.5	≤0.02	≤0.08	0.25-0.45	0.4-0.9	0.05-0.4

3. Mechanical Properties

Grade	Mechanical Property
	Yield Strength (N/mm2)/(Mpa)	Tensile Strength (N/mm2)/(Mpa)	Elongtation (%)
SPA-H	355	490	≥22
Q235NH	≥235	360-510	≥23
Q355NH	355	490-630	≥20
Q450NQR1	345	470-630	≥21

4. Application: 1) SPA-H is a weathering steel for container processing, cutting and welding. SPA-H is mainly used for ship containers, steel bridges, ships and tanks to prevent atmospheric corrosion. 2) SPA-H weathering steel is mainly used to manufacture containers. The container transportation industry has a history of more than 50 years in the world. 30 years ago, my country's container transportation was still empty. Since the reform and opening up, my country's port construction and container transportation have continued to develop. Especially in recent years, the international community has faced the situation of "one container is hard to find. 5. Corrosion resistance principle： When steel is exposed to sunlight and wind, its corrosion resistance is especially important. After adding phosphorus, copper, chromium, nickel and other trace elements to the steel, a dense and strong protective film will be formed on the surface of the copper material, which can play a certain protective role. 6. Picture: 7. Delivery and Container Loading： 8. Package: 9. Related grade (Steel Plate): B480GNQR、Q450NQR1、09CuPCrNi-A、SPA-H、Q550NQR1、09CUP、COR-TEN、 cortenA、corten-B； 05CuPCrNi B450NQ B800NQ； Q235NH、Q295NH、Q295GNHJ、Q295GNH、Q345GNHJ、Q345GNHLJ、Q345GNH、 Q310GNHJ、Q310GNHLJ、Q355NH、460NH、Q460NH； 集装箱板Q295GNHJ、Q345GNHLJ 、Q345GNHJ； 焊接结构用耐候钢 16CuCr、12MnCuCr、15MnCuCr、15MnCuCr—QT；16MnR(HIC),08Cu,16MnCu, St37-3Cu3, A588M(A,B,C,K),A242MCL.2, Cor-TenB, 10CrMoAL, 16CuCr,12MnCuCr, 15MnCuCr,15MnCuCr-QT, 09CuPCrNi, SMA400(AW,BW,CW),A588,A570, SMA400(AP,BP,CP), SMA490(AW,BW,CW), SMA490(AP,BP,CP), SMA570W,SMA570P,Fe235W,Fe355W, WR50B,WR50C, Q345R(HIC),Q235NH(16CuCr), Q275NH,12MnCuCr,Q355NH,15MnCuCr; Q460NH,15MnCuCr-QT.